CVE-2026-61634: Rabbitmq Rabbitmq-Java-Client

None severity, CVSS 0.0. EPSS: 0.5% chance of exploitation in the next 30 days.

The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.33.0, the AMQP connection tuning path records the negotiated AMQP frame_max value, but src/main/java/com/rabbitmq/client/impl/SocketFrameHandler.java and NettyFrameHandlerFactory continue to validate broker-controlled frame payload lengths against maxInboundMessageBodySize because the negotiated limit is not applied consistently through setMaxInboundFramePayloadSize. A malicious or compromised broker can send a method frame larger than the negotiated frame_max during or after connection establishment, causing the client to allocate and decode a protocol-invalid frame instead of rejecting it with MalformedFrameException. The protocol violation can disrupt the affected connection and cause client-side denial of service. This issue is fixed in version 5.33.0.

Affected products

• Rabbitmq Rabbitmq-Java-Client: before 5.33.0 (fixed in 5.33.0)

Published 2026-08-18. Last modified 2026-09-10.